/*

* Copyright (c) 2004-2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Base class for PolyLine and PolySpline classes.

*

*/

#include "AknsAlPolyBase.h"

#include <e32debug.h>

// -----------------------------------------------------------------------------

// Constructor.

// -----------------------------------------------------------------------------

//

CAknsAlPolyBase::CAknsAlPolyBase()

    {

    iPoints = NULL; // not needed, but just in case

    }

// -----------------------------------------------------------------------------

// Destructor.

// -----------------------------------------------------------------------------

//

CAknsAlPolyBase::~CAknsAlPolyBase()

    {

    delete iPoints;

    iPoints = NULL;

    }

// -----------------------------------------------------------------------------

// Sets scaled area.

// -----------------------------------------------------------------------------

//

void CAknsAlPolyBase::SetScaledArea( const TSize aAreaSize )

    {

    iAreaSize = aAreaSize;

    }

// -----------------------------------------------------------------------------

// Sets poly points.

// -----------------------------------------------------------------------------

//

void CAknsAlPolyBase::SetPolyPointsL( const TDesC16& aPointString )

    {

    TInt coordCount = aPointString.Length();

    if ((coordCount & 0x1) || coordCount < 4) // odd number or too few point coordinates

        {

        RDebug::Printf("%s, line %d, ERROR: Illegal coordinate count", __FILE__, __LINE__);

        User::Leave(KErrArgument);

        }

    iPointCount = coordCount >> 1;

    iPoints = new (ELeave) TPolyPoint[iPointCount];

    iPoints[0].iX = aPointString[0];

    iPoints[0].iY = aPointString[1];

    TUint16 oldX = iPoints[0].iX;

    TUint16 oldY = iPoints[0].iY;

    // parse numbers from the descriptor

    for (TInt i = 1; i < iPointCount; i++) // first point already set

        {

        iPoints[i].iX = aPointString[i*2];

        iPoints[i].iY = aPointString[i*2+1];

        if (oldX == iPoints[i].iX && oldY == iPoints[i].iY)

            {

            RDebug::Printf("%s, line %d, ERROR: subsequent coordinates cannot be equal", __FILE__, __LINE__);

            User::Leave(KErrArgument);

            }

        oldX = iPoints[i].iX;

        oldY = iPoints[i].iY;

        }

    }

// -----------------------------------------------------------------------------

// Sets poly1D points.

// -----------------------------------------------------------------------------

//

void CAknsAlPolyBase::SetPolyPoints1DL( const TDesC16& aPointString )

    {

    TInt coordCount = aPointString.Length();

    if ((coordCount & 0x1) || coordCount < 4) // odd number or too few point coordinates

        User::Leave(KErrArgument);

    iPointCount = coordCount >> 1;

    iPoints = new (ELeave) TPolyPoint[iPointCount];

    iPoints[0].iX = aPointString[0];

    iPoints[0].iY = aPointString[1];

    TUint16 oldX = iPoints[0].iX;

    // parse numbers from the descriptor

    for (TInt i = 1; i < iPointCount; i++) // first point already set

        {

        iPoints[i].iX = aPointString[i*2];

        iPoints[i].iY = aPointString[i*2+1];

        if (iPoints[i].iX < oldX) // points must be in ascending order

            User::Leave(KErrArgument);

        oldX = iPoints[i].iX;

        }

    }

// Some helper methods for child classes

// -----------------------------------------------------------------------------

// Squareroot.

// -----------------------------------------------------------------------------

//

TUint CAknsAlPolyBase::Sqrt( TUint aParam )

    {

    TUint t,b,c=0;

    for (b=0x40000000;b!=0;b>>=2)

        {

        t = c + b;

        c >>= 1;

        if (t <= aParam)

            {

            aParam -= t;

            c += b;

            }

        }

    return(c);

    }

// -----------------------------------------------------------------------------

// Calculates scaled point.

// -----------------------------------------------------------------------------

//

TPoint CAknsAlPolyBase::CalculateScaledPoint( const TPoint aPoint )

    {

    TPoint ret(0,0);

    if (iAreaSize.iWidth == 0)

        {

        ret.iX = aPoint.iX;

        }

    else

        {

        ret.iX = (aPoint.iX * iAreaSize.iWidth) >> 16;

        }

    if (iAreaSize.iHeight == 0)

        {

        ret.iY = aPoint.iY;

        }

    else

        {

        ret.iY = (aPoint.iY * iAreaSize.iHeight) >> 16;

        }

    return ret;

    }

// End of file